| 12 × | web-archiving | 6 × | standards | 4 × | digital-preservation | ||
| 11 × | file-formats | 6 × | meta | 4 × | disk-imaging | ||
| 10 × | acquisition | 6 × | media | 4 × | external-hard-drives | ||
| 9 × | hardware | 5 × | digital-forensics | 4 × | terminology | ||
| 8 × | technology | 5 × | disk-image | 4 × | planning | ||
| 8 × | tools | 5 × | software | 4 × | policy | ||
| 8 × | storage | 5 × | forensics | 3 × | aprasial | ||
| 6 × | warc | 5 × | checksums | 3 × | software-licensing | ||
| 6 × | policies | 5 × | metadata | 3 × | format | ||
| 6 × | fixity | 4 × | cd-rom | 3 × | selection |